JP3113249U - heat pipe - Google Patents

Abstract

To provide a heat pipe having high heat dissipation performance.
In a heat pipe that achieves heat radiation by a work fluid suction / heat release cycle in a heat pipe (1), the heat pipe (1) includes a tube (10), a copper powder (20), and a metal net (30). ), The tube (10) is a hollow metal tube, the inner wall of the tube (10) has a plurality of grooves (12), and the metal net (30) is accommodated in the tube (10). The copper powder (20) is accommodated in the gap, and is fixed to the surface of the grooves (12) by sintering.
[Selection] Figure 5

Description

  The present invention relates to a type of heat pipe, and more particularly to a heat pipe with improved heat dissipation performance.

  With the rapid development of the 3C science and technology industry, various 3C electronic products have constantly developed new and inventive designs in terms of their functions. A problem has arisen, and for this reason, most electronic products are equipped with a heat dissipation module to eliminate the heat energy inside the product.

  Taking a computer product as an example, if the heat energy generated by the electronic component cannot be eliminated, the temperature gradually increases, and the computer is stopped or cannot be operated due to overheating. For this reason, generally, a personal computer is provided with a heat sink and a heat radiating fan, and the heat sink is a metal piece having a plurality of fins on the surface, and is used to lower the temperature of the computer equipment. Although the heat radiation area is increased by this heat sink, the removal of the heat energy must depend on the surrounding air flow, and therefore, the fan blows away the heat of the heat sink. However, the heat sink described above is not efficient in heat conduction, and therefore heat cannot be removed from the case within a short time. This has led to the development of heat pipes, an advanced heat dissipation technology.

  The heat pipe is a closed metal tube, and an appropriate amount of working fluid, such as water or acetone, is enclosed inside. When one end (heating end) of the heat pipe receives heat, since the working fluid is in a vacuum state, the working fluid generates vapor pressure, and this vapor is directed toward the other end (cooling end) where the pressure is relatively low. The flow and condensation at this end and the latent heat of condensation are released, and the cooled working fluid is further returned to the heating end by capillary action. This achieves the purpose of heat conduction by constant evaporation and cooling.

  The flow rate of the gas phase fluid in the heat pipe is much higher than the speed at which the liquid phase working fluid returns to the heating end, so the return speed of the liquid phase working fluid is a determinant of the heat transfer performance. In known heat pipes, the speed at which the liquid-phase working fluid returns is accelerated by a method in which a groove is formed inside or a capillary structure such as a metal net is provided inside. At present, however, there is a design that further sinters copper powder on the inner wall of the metal tube to form a one-phase porous material to help return the liquid-phase working fluid to the heated end by capillary action.

  Patent Document 1 describes a heat pipe in which a capillary tissue is made of copper powder. A manufacturing flow of this heat pipe is as shown in FIGS. 1 to 3, and a tubular body 100 has an open end 102 and a closed end 104 ( 1), and after inserting the copper pillar 110 from the open end 102 of the tube 100, the copper powder 120 is injected, and the copper powder 120 is adhered to the inner surface of the tube 100 by a sintering method (see FIG. 1). 2), the copper pillar 110 is extracted to form the inner hole 106 (FIG. 3), and then the working fluid (not shown) is injected after the tube body 100 is evacuated and vacuumed, and the open end 102 is sealed. In this way, the copper powder 120 can be used to conduct heat rapidly so that a good heat dissipation effect can be achieved.

  However, the above-mentioned heat pipe must extract the copper pillar 110 during the manufacturing process, and at this time, the copper powder 120 is extracted together with the copper pillar 110, so that the content of the copper powder 120 sintered on the inner wall of the tube body 100 is reduced. The heat dissipation effect is reduced, the processing process is not easy, labor and time are required, and the manufacturing cost is relatively high.

Taiwan Patent Publication No. 572250 Specification

  The present invention aims to provide a kind of heat pipe, which uses a combination of a tube with grooves and copper powder and a metal mesh, and technical means adopting the metal mesh instead of the well-known copper pillars With this, copper powder adheres well in the groove of the tube body, and the heat pipe is provided with good capillary force, thermal conductivity and permeability, achieving a good heat dissipation effect, easy to process and manufacturing cost It is assumed that the heat pipe has the advantage of lowering the temperature.

The invention of claim 1 is a heat pipe that achieves heat radiation by a work fluid suction / heat release cycle in the heat pipe (1).
The heat pipe (1) includes a tube (10), a copper powder (20), and a metal net (30). The tube (10) is a hollow metal tube, and the tube (10). And the metal mesh (30) is accommodated in the tube (10) and has a gap between the inner wall of the tube (10), and a copper powder. (20) is a heat pipe which is accommodated in the gap and is fixed to the surface of the groove (12) by sintering.
The invention of claim 2 is a heat pipe according to claim 1, characterized in that the tube (10) is made of copper.
The invention of claim 3 is the heat pipe according to claim 1, wherein the metal net (30) is made of copper.
The invention of claim 4 is the heat pipe according to claim 1, characterized in that the metal net (30) is sintered and fixed to the inner wall of the pipe body (10).

  The heat pipe of the present invention uses a combination of a tube body with a groove, copper powder and a metal mesh, and the technical means adopting the metal mesh in place of a well-known copper pillar, the copper powder can be satisfactorily removed from the tube body. Adhering to the inside of the groove and providing the heat pipe with good capillary force, thermal conductivity and permeability, and achieving a good heat dissipation effect, has the advantage of being easy to process and reducing the manufacturing cost.

  In order to achieve the above-mentioned object, the heat pipe of the present invention includes, in a preferred embodiment, a tube, and copper powder and a metal net installed in the tube and forming a capillary tissue. Among them, the inner wall of the tube body has a plurality of grooves, which increases the surface area of the tube body and the surface tension of the working fluid, thereby increasing the thermal conductivity and permeability of the heat pipe. In addition, a metal net is placed in the hollow part of the tube, thereby not only increasing the capillary force of the heat pipe, but also restricting the copper powder to be accommodated between the metal net and the wall of the tube, that is, inside the groove, Although it replaces the copper pillar used in a well-known technique, it is not necessary to take out a metal net | network, therefore there is no fault that copper powder is extracted with a copper pillar. In addition, the copper powder adheres to the inside of the groove to increase the capillary force of the heat pipe. Together with the subsequent sintering operation, both the copper powder and the metal net are fixed to the inner wall of the pipe, and the working fluid is heated to the heating end. Provides the necessary capillary tissue for return.

  The heat pipe of the present embodiment achieves the purpose of heat dissipation by the absorption / heat dissipation cycle of the internal working fluid, and the combination of two types of capillaries, copper powder and metal mesh, of the tube body having a groove is combined. The heat pipe has good capillary force, thermal conductivity and permeability, thereby accelerating the speed at which the liquid working fluid returns to the heating end. Moreover, the copper powder adheres well to the groove of the tubular body by means of adopting a metal net instead of the well-known copper pillar, thereby achieving the purpose of high heat dissipation effect.

  FIG. 4 shows a preferred embodiment of the heat pipe 1 submitted by the present invention. It includes a tube (10), and copper powder (20) and a metal net (30) that are placed inside the tube (10) to form a capillary tissue.

  See also FIG. Among them, the tube (10) is a hollow metal tube having a hollow portion (14) along the axial direction, and an appropriate amount of working fluid (not shown) such as pure water or acetone is contained in the hollow portion (14). It is enclosed and performs a heat release operation by a work fluid suction / heat release cycle. The inner wall of the tube (10) is provided with a plurality of grooves (12), and the design of the groove (12) increases the inner surface area of the tube (10) and increases the surface tension of the working fluid. The flow velocity in the hollow portion (14) of the fluid is accelerated, the working fluid can take up the maximum amount of heat, and the heat conduction capability and permeability are enhanced. In this embodiment, the groove (12) is used to accommodate the copper powder (20), and increases the amount of the copper powder (20) attached to the inner wall of the tube (10). The design of 12) can improve the adhesion of the copper powder (20) to the inner wall of the tube (10) after sintering.

  The material of the tube (10) is generally a copper material having a high thermal conductivity, and the tube (10) is a long copper tube. After being cut to a required length, one end is contracted and soldering or the like is performed. The sealing end (16) as shown in FIG. 4 is formed by the process. However, the method of forming the sealing end (16) is not limited to this example. The other end of the tube (10) is the open end (18), which is subsequently sealed after the action of capillary insertion.

  In the manufacturing process of the heat pipe (1) of the present embodiment, first, the metal net (30) is inserted from the open end (18) of the pipe body (10), and the metal net (30) is hollow in the pipe body (10). The metal mesh (30) is located in the portion (14) and is combined so that a plurality of axial metal wires (31) and a plurality of radial metal wires (32) cross each other. The copper material has high thermal conductivity, and the capillary force is increased by the metal net (30). Moreover, the diameter of this metal net | network (30) is a little smaller than the internal diameter of a pipe | tube body (10), and thereby a gap is formed between the pipe | tube (10) inner walls of a metal net | network (30), and copper powder (20) becomes It is housed and replaces the well-known copper pillar 110 described above. After inserting the metal mesh (30), the copper powder (20) is injected into the gap between the metal mesh (30) and the inner wall of the pipe body (10), that is, the copper powder (20) is located inside the groove (12). In addition, it is necessary to vibrate one side in the process of injecting the copper powder (20), whereby the powder of the copper powder (20) can be made solid and the capillary force can be increased by the copper powder (20). Subsequently, after high-temperature sintering, both the copper powder (20) and the metal net (30) were attached to the inner wall of the tube (10), and then the tube (10) was depressurized and evacuated. Inject working fluid (not shown) as well as seal open end (18).

  The metal mesh (30) of the present embodiment is not only a capillary tissue and increases the capillary force of the tube (10), but is also used in place of the well-known copper pillar 110 to replace the copper powder (20) with the metal mesh (30). ) And the inner wall of the tube (10), that is, limited to the inside of the groove (12) and sintering the copper powder (20), the metal mesh (30) is also sintered to the inner wall of the tube (10). Since it is fixed and there is no well-known process of extracting the copper pillar 110, the copper powder (20) adhering to the inner wall of the tube (10) does not decrease, and the amount of copper powder (20) attached can be maintained.

  The groove (12), the copper powder (20), and the metal net (30) have different advantages, all of which enhance the heat dissipation effect of the heat pipe (1). The heat pipe (1) achieves a good heat dissipation effect.

  When using this embodiment, as shown in FIG. 6, one end of the heat pipe (1) is in contact with the heat source (40), and the other end is in contact with or combined with the cooling device (50). Is a device that consumes power, such as a chip, CPU, or LCD, and the cooling device (50) is a heat sink that is used for heat dissipation by convection, or a heat dissipation fan that is used for heat dissipation by forced air blowing. Is done. The inside of the tube (10) is in a vacuum state, whereby the internal working fluid evaporates at about 30 degrees Celsius, and the amount of heat generated by the heat source (40) at one end contacting the heat source (40) of the heat pipe (1). The working fluid changes from the liquid phase to the gas phase, and the gas further flows through the hollow channel of the heat pipe (1) to reach one end where it is brought into contact with or combined with the cooling device (50). The amount of heat is removed by the device (50), thereby lowering the temperature, the working fluid is thereby cooled and returned to the liquid phase, and the cooled working fluid further flows into the groove (12) inside the heat pipe (1), The copper powder (20) and the metal net (30) return to one end (heating end) in contact with the heat source (40), thus completing a single absorption / radiation cycle and effectively removing heat.

  In summary, the heat pipe (1) of the present invention uses a combination of a tube (10) having a groove (12), copper powder (20) and a metal net (30), and a metal net (30). By means of technical means employed instead of the well-known copper pillar 110, the copper powder (20) is satisfactorily adhered in the groove (12) of the tube body (10), and the heat pipe (1) has good capillary force and heat. It has conductivity and permeability, achieves a good heat dissipation effect, and has the advantages of being easy to process and reducing manufacturing costs.

  Although the present invention is described in the above embodiments, the above description does not limit the scope of the present invention, and any modification or alteration of details that can be made based on the present invention is within the scope of the claims of the present invention. Shall belong.

It is a manufacturing method display figure of a well-known heat pipe. It is a manufacturing method display figure of a known heat pipe. It is a manufacturing method display figure of a well-known heat pipe. It is a structure display figure of the Example of the heat pipe of this invention. 1 is a transverse cross-sectional view of an embodiment of a heat pipe of the present invention. It is a use condition display figure of the example of the heat pipe of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Tube 102 Open end 104 Closed end 106 Middle hole 110 Copper pillar 120 Copper powder 1 Heat pipe 10 Tube 12 Groove 14 Hollow part 16 Sealed end 18 Open end 20 Copper powder 30 Metal mesh 31 Metal wire 32 Metal wire 40 Heat source 50 Cooling system

Claims (4)

In the heat pipe that achieves heat dissipation by the absorption / radiation cycle of the working fluid in the heat pipe (1),
The heat pipe (1) includes a tube (10), a copper powder (20), and a metal net (30). The tube (10) is a hollow metal tube, and the tube (10). And the metal mesh (30) is accommodated in the tube (10) and has a gap between the inner wall of the tube (10), and a copper powder. (20) is housed in the gap and is fixed to the surface of the groove (12) by sintering.   2. The heat pipe according to claim 1, wherein the material of the pipe body (10) is a copper material.   The heat pipe according to claim 1, wherein the metal net (30) is made of copper. The heat pipe according to claim 1, characterized in that the metal net (30) is sintered and fixed to the inner wall of the tubular body (10).

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